... 族群压力 population pressure 族群大小 population size;breeding size 族群系统 population systems ...
基于4个网页-相关网页
age-structure fish population systems 年龄结构鱼群系统
variable population systems 时变种群系统
artificial population systems 人工人口系统
large scale population systems 人口大系统
time-varying population systems 时变人口系统
semi-discrete population systems 半离散人口系统
To start with, it forced the population to abandon the nomad's life and became sedentary, to develop methods of storage and, often, systems of irrigation.
首先,它会迫使人们放弃游牧生活定居下来,因而使人们开发存储的方法,往往也会开发灌溉系统。
In both these systems, the overwhelming majority of the population is equal and powerless.
在这两个系统中,占绝大多数的人口都是平等而软弱无力的。
Again, in the absence of well-functioning health systems, we are unlikely to get even the most basic population data on morbidity and mortality.
同样,如果缺乏运转良好的卫生系统,我们甚至不可能获取关于发病率和死亡率的最基本的人口数据。
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